Techniques of conventional chromatography do not always give convenient results. Analyses are often contaminated with detector noise and baseline drift. Continuous analysis is not possible and anomalous detector response can occur. This report proposes a method which overcomes these difficulties to a certain degree. A pseudo- random sequence controls the injections into a conventional column. Cross-correlation between input and output yields the chromatogram to within a constant factor. Sample valve and detector must be operated in a linear fashion. The resultant data analysis requires digital computation, but this can be carried out on-line.